RUBY-1115 Make create index #message API consistent
RUBY-1115 Make create index #message API consistent

saghm/mongo-ruby-driver,mongodb/mongo-ruby-driver,saghm/mongo-ruby-driver,estolfo/mongo-ruby-driver,jonhyman/mongo-ruby-driver,mongodb/mongo-ruby-driver,jonhyman/mongo-ruby-driver,kay-kim/mongo-ruby-driver,estolfo/mongo-ruby-driver,mongodb/mongo-ruby-driver,kay-kim/mongo-ruby-driver